Mine-drill



Patnted. May 27, 1919.

F; [II

fitter/mu F. KALATA.

MINE DRILL.

APPLICATION FILED IAN-24.1919.

FIG. 2.

. ,UNITED s'rATEsr T NT oFFIoE.

FRANK KALA'IA, or srnIIqerIELn, ILLINoIs.

MINE-DRILL.

To all whom it may concern:

Be it known that I, FRANK KALATA, acitizen of Poland, residing atSpringfield, in the county of Sangamon and State of Illinois, haveinvented certain new and useful Improvements in Mine-Drills, of whichthe following is a specification.

The primary object of the invention is the provision of a drillingdevice serviceable in a mine and comprising a bit and a readilyseparable holder therefor, the structure possessing great strength andone bit being easily and quickly replaced by another when the bitbecomes dull or broken.

A further object of the invention is the provision of a form of bit andholder in which the bit is readily detached from the holder when desiredand is automatically held therein upon insertion of the holder.

lVith these general objects in view, the invention consists of thecombination and arrangement of parts hereinafter fully de-, scribed inconnection'with the accompanying drawing and in which like referencecharacters designate corresponding parts throughout the several views.

In the drawings,

Figure 1 is an elevational View of the invention with parts broken away.

Fig. 2 is a longitudinal sectional view taken upon line IIII of Fig. 1.

Figs. 3 and 1 are transverse sectional views taken upon lines IIIIIIandIVIV respectively of Fig. 1, and

Fig. 5 is a perspective view of the attaching end or tang portion of thebit.

Referring more in detail to the drawing,

my invention broadly includes a socket 11 secured upon the end of theboring or drill shaft 12 by means of holdfast devices 18, a bit or drill11 being adaptable for detachable connection with the socket 11.

The bit 11 has a sharpened drill portion 15 with a tang 16, oval incross section with cut-away side portions or notches17 forming a head 18upon the free end of the tang 16. The socket member 11 has an oval bore19 axially thereof for the reception of the tang 16, the head 18 of thetang being received within the inner end portion or socket 20 of themember 11 when the device is assembled. Substantially T-shaped openings21 in the opposite sides of the socket member 11 communicate with thebore 19. A jaw 22 is pivoted by means of a pin 23 within the openings 21in such a manner Specification of Letters Patent. Patented :M 2'7, 1919Application filed January 24, 1919.

Serial No. 272,849.

that the enter faces of the jaws 22 normally lle :flush with theadjacent outer sides of the socket member 11.

The enlarged .end portions 21 of the jaws 22 thinner than thenarrowerend portions 25v of the jaws which are in the form of blocksadapted for engaging within the notches 17 of the tang 16 for retainingthe bit 14 connected to the socket member 11. Leaf springs 26 aresecured by screws 27 to the inner faces of the block portions 25 of The.springs 26 normally hold-the block portions 2 10f the jaws pressedinwardly so that the forcible entrance of the tang 16 into the bore 19engages the block portions 21 in'the notches 17 when the head 18 of thetang 16 seats within the inner socket portion 20 of said bore 19. Atsuch times, the end face 28 of the head 18 flatly engages the bottom 29of the socket 20 which forms the inner end of the bore 19 so that thebit is held in the socket member in such a man ner that the downwardmovement of the drill shaft 12 acts directly upon the tang head 28 ofthe .bit 14 during the dril-lingor boring operation.

When it is desired to remove the bit 11 from the socket member 11, theportions 21 of the jaws 22 are depressed and the jaws rocked upon theirpivot 23 which disengages the block portion 25 thereof from theirengagement with the sockets 17 of the bit tang 16, releasing the head 18and permitting the removal of the tang 16 from the bore 19. A structureof great strength is provided, one that is of simple construction, thebit being instantly secured in and removed from the socket member 11when desired.

What I claim as new is 1. A device of the class described comprising asocket member having an axial bore oval in cross section and withsubstantially T-shaped opposite openings through the sides of the socketmember communicating with said bore and forming ledges at opp0- sitesides adjacent the open end of the bore and a socket at the inner end ofthe bore, jaws pivoted within said openings having block portionsnormally projecting into sald bore and relatively thin and wide fingerengaging portions outwardly of said ledges and positioning springssecured to the inner sides of the block portions of the jaws and bearingupon said ledges, whereby the outer faces of the jaws are normallymaintained flush with the opposite outer faces of the socket member.

2. A device of the class described compris ing a socket member having anaxial bore oval in cross section and withsubstantially T-shaped oppositeopenings through the sides of the socket member communicating with saidbore and forming ledges at opposite sides adjacent the open end of thebore and a socket at the inner end of the bore, jaws pivoted within saidopenings having block portions normally projecting into said bore andrelatively thin and wide finger engaging portions outwardly of Saidledges, positioning springs secured to the inner sides of' the blockportions of the jaws and bearing upon said ledges, whereby the outerfaces of the jaws are normally maintained flush with the opposite outerfaces of the socket memher, a bit having a tang oval in cross sectionadapted for removable reception within said bore, the said tang havingopposite notches forming a head at the free end of the tang, the saidhead being adapted for seating within the socket portion of the borewith the block portions of said jaws engaging within said notches whenthe device is assembled.

3. A device of the class described comprising a socket member for adrill having an axial bore open at the end of the socket and terminatingin an end face located therein, the said socket member havingsubstantially T-shaped cut-away portions in its opposite sides providingopenings communicating with said bore spaced from the inner end of thelatter and forming opposite ledges spaced from the open end of the bore,substantially T-shaped jaws pivoted in said cut-away portions withrelatively thin and Wide ends overlying said ledges and relativelynarrow and thick block portions within said openings normally projectingwithin the bore at a distance from the inner end of the bore, and normalpositioning springs for the jaws attached to the block portions thereofand resiliently engaging the outer faces of said ledges.

4. A device of the class described compris ing a socket member for adrill having an axial bore open at the end of the socket and terminatingin an end face located therein, the said socket member havingsubstantially T-sha-ped cut-away portions in its opposite sidesproviding openings communicating with said bore spaced from the innerend of the latter and forming opposite ledges spaced from the open endof the bore, substantially T-shaped jaws pivoted in said cut awayportions with relatively thin and wide ends overlying said ledges andrelatively narrow and thick block portions within said openings normallyprojecting within the bore at a distance from the inner end of the bore,normal positioning springs for the jaws attached to the block portionsthereof and resiliently engaging the outer faces of said lodges, a bitmember having a tang adapted for removable reception within said boreprovided with side notches adapted for the reception of the blockportions of the jaws when the free end portion of the tang is seated inthe inner end portion of the bore in engagement therewith when thedevice is assembled for use.

In testimony whereof I a'lfix my signature.

FRANK KALATA.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. 0.

